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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dd7d044527f2e45ae1900054b87156a94a8deb8d20a90d85dc245c05a695b6b' 
  AND token = 'q6wxycijg4F/x9mwQUZOoEE/SVCVopYmQWVGUI4Yj9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}